Research indicates that tutorials can have a negative impact on some types of videogames. This project sets out to investigate the impact of explaining the core rules of a 3D puzzle game universe to the player in the beginning of the game. The core rules are as follows: In this world, you - the player - don't collide with unlit parts of surfaces, and you don't cast a shadow. Through an experiment, 15 test participants with the rules and 15 without were tested. The understanding of the rules, as well as the enjoyment of the game, were measured in each group. Participants were interrupted between puzzles and asked questions about their process of solving the puzzles and their enjoyment. Furthermore, the participants' understanding was tested after the playthrough via a questionnaire. 
The results showed that the participants with the rules understood it slightly better, and that there was no significant difference in the enjoyment between both groups.
These results only apply to this specific game. It could be examined how the findings apply to other games as well.